JavaScriptのビットシフト(ビット演算) - Qiitavar num = 120 console.log(num >> 0); //120 console.log(num >> 1); //60 console.log(num >> 2); //30 console.log(num << 1); //240 console.log(num << 2); //480 console.log('abc' << 2); //文字列の場合は0が返るみたい var num = 12.123 console.log(num >> 0); //12 console.log(num >> 1); //6 console.log(num >> 2); //3 console.log(num << 1); //24 console.log(num << 2); //48
